Abstract
The purpose of this study was to assess the ability of blindfolded, visually impaired, and sighted individuals to estimate object height as a function of cane length, cane diameter, and judgment type. 48 undergraduate students (ages 20 to 23 years) were recruited to participate in the study. Partici...
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PMID: 20499568
PDF is available here.
Abstract
We did a series of experiments involving 11 healthy subjects. The skin on the volar aspect of the forearm was used as the target area for sensory input. Experiments included discrimination of site of stimuli and pressure levels at a single stimulation point. A tactile display based on digital servom...
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PMID: 20158428
PDF is available here.
Abstract
Our results indicate the great value of low vision rehabilitation through adequate providing of vision aids for the improvement of reading ability, with a highly significant increase of reading speed without training of eccentric viewing in patients with retained central fixation. The prompt impleme...
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PMID: 19141148
PDF is available here.
Abstract
In these countries, many children are placed inappropriately in special schools and annexes for the blind. The reasons are multiple and to rectify the situation will require advocacy and cooperation between ministries of health and education....
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PMID: 19460267
PDF is available here.
Abstract
The number of older Americans afflicted by Alzheimer disease and related dementias will triple to 13 million persons by 2050, thus greatly increasing healthcare needs. An approach to this emerging crisis is the development and deployment of intelligent assistive technologies that compensate for the...
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PMID: 18849532
PDF is available here.
Abstract
We processed sounds produced by 45 representative environmental events with the different algorithms and presented them to subjects as tactile stimuli using a wide-band stationary vibrator. We compared eight algorithms based on the three principles (one unprocessed, as reference). The subjects ident...
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PMID: 20157859
PDF is available here.
Abstract
Assuming that the simulated gaze-locked viewing conditions are extended to implant wearers, such prosthetic vision can be helpful for wayfinding in simple mobility tasks, though phosphene dropout may interfere with performance....
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PMID: 18981914
PDF is available here.
Abstract
OBJECTIVE: An optical character recognition (OCR) reading machine is a significant help for visually impaired patients. MATERIALS AND METHODS: An OCR reading machine is used. DISCUSSION: This instrument can provide a significant help in order to improve the quality of life of patients with low visio...
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PMID: 18953732
PDF is available here.
Abstract
Average signed lateral and elevation errors were less than 1.6 degrees for all vection conditions. The effects of vection condition on lateral and elevation errors were not statistically significant. Also, the interactions between vection condition and sound-source location for these errors were not...
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PMID: 18581946
PDF is available here.
Abstract
This survey aimed to evaluate how helpful parents and those working in the educational setting found written low vision assessment reports. A questionnaire survey was sent to 25 parents and to the corresponding and relevant member of the educational team for each of the 25 children. All were satisfi...
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PMID: 18426423
PDF is available here.
Abstract
The treatment group demonstrated significant improvement in all aspects of visual function compared with the control group. The difference in mean changes was 2.43 logits (95% confidence interval [CI], 2.07-2.77; P < .001; effect size, 2.51) for visual reading ability; 0.84 logit (95% CI, 0.58-1.10;...
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PMID: 18474769
PDF is available here.
Abstract
Nerve injuries in the upper extremity may severely affect hand function. Cutaneous forearm anaesthesia has been shown to improve hand sensation in nerve-injured patients. A blind man who lost his Braille reading capability after an axillary plexus injury was treated with temporary cutaneous forearm...
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PMID: 18382287
PDF is available here.
Abstract
We investigated two mechanisms for temporal masking of vibrotactile stimuli (backwards and common-onset) using a commodity display. We used a two-channel setup, presenting stimuli to the middle and ring finger of a participant's right hand. The stimuli consisted of 250 Hz sinusoidal waveforms displa...
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PMID: 18394522
PDF is available here.
Abstract
Persons with multiple disabilities are often unable to interact with their environment due to their limited response repertoire. Microswitch programs are designed to help them control environmental events, generally preferred stimulation, through simple (feasible) responses. To make microswitch prog...
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PMID: 18556894
PDF is available here.
Abstract
The findings indicate that standard low-vision rehabilitation programs, conventional in-clinic assessments, and optical devices are effective ways of managing and living with vision loss. Areas of unmet need include determining which types of orientation and mobility programs and devices are most ef...
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PMID: 18347620
PDF is available here.
Abstract
Indoor navigation technology is needed to support seamless mobility for the visually impaired. A small portable personal navigation device that provides current position, useful contextual wayfinding information about the indoor environment and directions to a destination would great...
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PMID: 19163698
PDF is available here.
Abstract
We begin by outlining the basic operational characteristics of the visual system, as this knowledge is essential for producing a prosthetic device based on electrical stimulation through arrays of implanted electrodes. We then list a series of tenets that we believe need to be followed in this effor...
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PMID: 19065857
PDF is available here.
Abstract
It is important to include direct questions regarding visual hallucinations in the case history of a low vision examination. LVR may decrease the frequency of CBS hallucinations in some patients. Rehabilitation strategies should include low vision devices that allow for improved visual function and...
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PMID: 18320478
PDF is available here.
Abstract
We systematically stimulated the entire occipital cortex using single pulse transcranial magnetic stimulation (TMS) in early blind subjects and in blindfolded seeing controls. Whereas blindfolded seeing controls reported only phosphenes following occipital cortex stimulation, some of the blind subje...
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PMID: 17717652
PDF is available here.
Abstract
The numerical preference for the low-vision aids was: 5 patients for the reading stand and a magnifier that maintains at a stable position the reading line and focus; 2 patients for the hand magnifier; 1 patient indifferent regarding any of the resources; 1 patient inadequate for the evaluation of t...
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PMID: 18641826
PDF is available here.
Abstract
We found, however, a larger proportion of early blind in the two highest visual acuity categories (1/150 and 1/90). These results extend earlier findings that it is possible to measure visual acuity in the blind individuals using the tongue. Moreover, our data demonstrate that a subgroup of early bl...
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PMID: 18007183
PDF is available here.
Abstract
We investigated the possible benefit for 26 patients with multiple sclerosis of placing Intuitive Overlays (spectral filters) over the page during reading and visual search. Initially all patients were allowed to select an overlay of a colour that reduced perceptual distortion and were tested with a...
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PMID: 17934874
PDF is available here.
Abstract
Personality dimensions of participants who suffer from visual stress were compared with those of normal participants using the Eysenck Personality Inventory. Extraversion-Introversion scores showed no significant differences between the participants who suffered visual stress and those who were clas...
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PMID: 17956366
PDF is available here.
Abstract
We developed a finger cover made of soft, thin polyester non-woven fabric to reduce friction during Braille reading. We also carried out a study to investigate the effect of its use. The subjects were 12 Braille learners with acquired visual impairment, who were asked to read randomly selected chara...
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PMID: 17846807
PDF is available here.
Abstract
The purpose of this study was to investigate the validity of manual application of the grating orientation task (GOT), as currently used in fundamental and clinical research. Six examiners tested 12 subjects following recommendations of the literature. The results show that the normal force applied w...
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PMID: 17853056
PDF is available here.
Abstract
Manual dexterity should be considered as a possible prognostic factor for successful use of a hand-held low-vision aid. It is not known whether the deficit can be overcome with suitable training....
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PMID: 17724229
PDF is available here.
Abstract
OBJECTIVE: To design and test a miniature ambulatory hot flash recorder that uses neither electrodes nor gel. DESIGN: In the first study, putative hot flashes recorded by using a relative humidity sensor were compared with patient event marks. In the second study, relative humidity recorded by using...
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PMID: 17445808
PDF is available here.
Abstract
We investigated the decreased and increased functional connectivities in the early blind using resting state fMRI data. The altered functional connectivities were identified by comparing the correlation coefficients of each pair of brain regions of 16 early blind subjects (9 males; age range: 15.6-2...
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PMID: 17533167
PDF is available here.
Abstract
We investigated whether an auditory peripersonal space exists around the hand and whether such a space might be extended by a brief tool-use experience or by long-term experience using a tool in everyday life. To this end, we studied audio-tactile integration in the space around the hand and in far...
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PMID: 17614874
PDF is available here.
Abstract
The results revealed a correspondence between specific types of NVG-related errors and elements of the Human Factors Analysis and Classification System (HFACS). In addition, uncertainty emerged as a significant factor associated with the critical incidents that were recalled by operators. CONCLUSION...
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PMID: 17447663
PDF is available here.
Abstract
We applied repetitive transcranial magnetic stimulation (rTMS) over midoccipital (MOC) and primary somatosensory (SI) cortex in blind subjects. After rTMS of MOC, but not SI, subjects made significantly more errors and showed an abolishment of the improvement in reading speed following repetitive pr...
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PMID: 17325278
PDF is available here.
Abstract
Questionnaires filled out by 24 helicopter pilots using the night vision glasses (NVG) showed that minimization of the risk of visual discomfort was, first of all achieved through proper adjustment of image brightness and setting NVG time limits. The experiments enabled determination of the most fav...
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PMID: 18672513
PDF is available here.
Abstract
We quantified page navigation strategies and difficulties of people with AMD reading with magnifiers. Retrace, which presents the most common difficulty, is not well predicted by vision measures or magnifier characteristics; future studies should investigate the relationship between motor skills and...
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PMID: 17220774
PDF is available here.
Abstract
The most frequently used aids were magnifiers (61%), glasses for near vision (34%), closed circuit television (20%), and monocular telescopes (20%). Of the 105 patients, 85 (81%) reported on frequent use of the devices, with just 3 patients (3%) reporting that they hardly ever used the aids. Only 2%...
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PMID: 17043773
PDF is available here.
Abstract
Positive results in initial testing and a sound theoretical basis for the hardware warrant continued development and testing, which is being conducted at three sites....
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PMID: 17154697
PDF is available here.
Abstract
Of 803 respondents, 56% were male and the mean age was 73 years. Use of services (e.g., counseling, rehabilitation), and devices significantly increased as VA decreased. Using standard US costs, costs for services, supplements, and devices ranged from 506-1619 US dollars depending on VA. CONCLUSION:...
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PMID: 17083181
PDF is available here.
Abstract
Two methods of assessing candidates for coloured overlays were compared with the aim of determining which method had the most practical utility. A total of 58 adults were assessed as potential candidates for coloured overlays, using two methods; a questionnaire, which identified self-reported previo...
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PMID: 17040420
PDF is available here.
David K DK Gieser,
R R Tracy Williams,
William W O'Connell,
Louis R LR Pasquale,
Bruce P BP Rosenthal,
John G JG Walt,
Laura M LM Katz,
Lisa R LR Siegartel,
Lujing L Wang,
Lisa C LC Rosenblatt,
Lee S LS Stern and
John J JJ Doyle
Abstract
End-stage glaucoma is associated with appreciable resource utilization and costs, because of both vision rehabilitation and ophthalmology care. Advanced primary open-angle glaucoma has a substantial cost-of-illness, warranting improved management in early stages of disease....
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PMID: 16988605
PDF is available here.
Abstract
We tested this hypothesis in a functional magnetic resonance imaging study designed to reveal activation appropriate to the nature of tactile stimulation. In late-blind individuals, hMT/V5 and fusiform face area activated during visual imagery of moving patterns or faces. When they touched a doll's...
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PMID: 16932143
PDF is available here.
Abstract
We designed a retrospective case-control study to determine whether the harvesting of tragal cartilage had any effect on the ability to wear 'in the ear' earphones. Fifty patients who had undergone ear surgery requiring harvesting of tragal cartilage, along with 50 age-matched controls who had under...
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PMID: 16939664
PDF is available here.
Abstract
Although performance improvement with the device for the larger search area was obvious, whether it was helpful for the smaller search area depended on VF and gaze speed. Because improvement in directness was demonstrated, increased gaze speed, which could result from further training and adaptation...
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PMID: 16936136
PDF is available here.
Abstract
A liquid isooctane (C8H18) filled ionization chamber linear array developed for radiotherapy quality assurance, consisting of 128 pixels (each of them with a 1.7 mm pitch), has been used to acquire profiles of several intensity modulated fields. The results were compared with film measurements using...
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PMID: 16723758
PDF is available here.
Abstract
Blind Australians find great difficulty in recognising bank notes. Each note has the same feel, with no Braille markings, irregular edges or other tangible features. In Australia, there is only one device available that can assist blind people recognise their notes. Internationally, there are device...
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PMID: 16845929
PDF is available here.
Abstract
We must ensure that the capacity of our system continues to provide adequately for clientele in the future....
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PMID: 16767193
PDF is available here.
Abstract
We hope these results will be helpful to the design of visual prosthesis for the rehabilitation of reading abilities....
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PMID: 16380147
PDF is available here.
Abstract
Night vision goggles (NVGs) are used by military personnel operating in low-light environments. It is not known whether NVGs can be used by medical personnel to provide emergency care under such conditions. This was a randomized controlled study to determine the effect of NVGs on the performance of...
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PMID: 16673738
PDF is available here.
Abstract
It is uncertain whether and to what extent retinal reorganization may limit the perception of multiple phosphenes by blind prosthesis recipients. If distinct phosphenes can be perceived, these results suggest that a 3 x 3-mm2 prosthesis with 16 x 16 electrodes should allow paragraph reading. The eff...
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PMID: 16505065
PDF is available here.
Abstract
No medical treatments are currently available for bilateral end-stage age-related macular degeneration (atrophic or disciform scar age-related macular degeneration). The visual prosthetic device discussed in this update is implanted in the posterior chamber to reduce the impact of the scotomata on t...
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PMID: 16436930
PDF is available here.
Abstract
A palm-sized microfluidic recirculation system and customized media enable simplified long-term culture and imaging of cells. The combination of bare Braille display modules, a leveled monolithic surface for complete chip mounting, and a transparent heater improved portability, mechanical stability...
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PMID: 16372083
PDF is available here.
Abstract
Further research is needed on the comparison of different types of low vision aids. It will be also necessary to delineate patient's characteristics that predict performance with costly electronic devices as well as their sustained use in the long term compared to simpler and cheaper optical devices...
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PMID: 17054166
PDF is available here.